Explanation

• QR stands for Quick Response
• Used in QR codes for fast data access and scanning.

 Last updated 12 april 2026

Explanation

PII means any information that can identify a person

 Examples include:

• Name
• CNIC / ID number
• Phone number
• Email address

Explanation

• LED (Light Emitting Diode) is a semiconductor device that emits light when electric current passes through it.
• It is widely used in lighting, displays, electronic indicators, and screens.

Additional information:

• Energy efficiency: Up to 90% more efficient than traditional bulbs
  First discovery: H. J. Round – 1907
  Early research: Oleg Losev – 1927
  Practical LED development: James R. Biard – 1961
  First commercial production: October 1962 (Nick Holonyak)

Last verified on 12-03-2026

Explanation

DOS stands for disk operating system

It is a command-line, text-based operating system designed to manage files 

Dennis Ritchie is the father of MS-DOS.

MS-DOS was developed in 1982.

Explanation